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Adsorbent minimisation in a two-stage batch adsorber for cadmium removal
Haya Alyasi,Hamish R. Mackey,Kavithaa Loganathan,Gordon McKay 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Cadmium is a toxic metal prevalent in a variety of industrial effluents that is toxic to both humans andanimals. This study utilizes nanochitosan, a polymer derived from crustacean shells, as an adsorbent forcadmium removal. The uptake capacity has been determined at 2.01 mmol/g and modelled by Langmuir,Freundlich and Sips isotherms, with the Sips isotherm the most suitable model for the adsorbent. In orderto minimise the amount of adsorbent used in a batch treatment process for the cadmium removal, a two-stage batch treatment has been proposed and optimised. A detailed evaluation is made of theconsequences of utilizing a less suitable isotherm, and on the benefits of utilizing a two-stage system overa single stage. Both errors from incorrect isotherms and advantages of a two-stage system are mostsignificant at low influent concentrations and high target removal efficiencies, relevant to environmentalregulatory discharge limits.